SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cb80210a44c09b58c586bec624a3042c8ad76b9198c1f775730b095f5220d9' 
  AND token = 'Rlj8w/+vrPMqmyrhoKbCWLZoRCNF6/pjR5TviaXm3ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}